How to disable extern RESET(PTA5) on the HCS08

adbensi · ‎02-06-2019

Hello!

I have disabled RSTPE with SOPT1 = 0, but PTA5 GPIO still reset the microcontroller when it was to low level.

Please, Can anyone please help me to understand this behaviour?

This is my source code to set it:

void main(void)
{
//*******************************************************************
 asm
 {
  ldhx   #$83F;#__SEG_END_SSTACK ; 
  txs;
 } // Inicializa Stack Pointer.
//*******************************************************************
// Inicializa Valores na RAM.
//
asm
{
 ldhx #$40
res:
 //sta  SRS
 clr ,x
 aix #1
 cphx #$0800
 bcs  res
 nop
}
//*******************************************************************
// Configura periféricos.
 /* WDOG_CNT: CNT=0xC520 */
 WDOG_CNT = 0xC520U;         /* First part of the WDG unlock sequence */ 
 /* WDOG_CNT: CNT=0xD928 */
 WDOG_CNT = 0xD928U;         /* Second part of the WDG unlock sequence */ 
 /* WDOG_TOVAL: TOVAL=4 */
 WDOG_TOVAL = 0x04U;          
 /* WDOG_CS2: WIN=0,FLG=0,??=0,PRES=0,??=0,??=0,CLK=1 */
 WDOG_CS2 = 0x11U;             
 /* WDOG_CS1: EN=0,INT=0,UPDATE=0,TST=0,DBG=0,WAIT=0,STOP=0 */
 WDOG_CS1 = 0x81U;            /* Disable watchdog */

 PORT_PTAOE=0b00001100; // Seleciona Saídas PortA
 PORT_PTBOE=0b00010010; // Seleciona Saídas PortB
 PORT_PTCOE=0b00001111; // Seleciona Saídas PortC
 PORT_PTDOE=0b00000000; // Seleciona Saídas PortD
 
 PORT_PTAIE=0b00100010; // Seleciona Entradas PortA
 PORT_PTBIE=0b11000101; // Seleciona Entradas PortB
 PORT_PTCIE=0b01000000; // Seleciona Entradas PortC
 PORT_PTDIE=0b00000000; // Seleciona Entradas PortD
 
 PORT_PTAPE=0b00100000; // Pullup PortA
 PORT_PTBPE=0b11000101; // Pullup PortB
 PORT_PTCPE=0b00000000; // Pullup PortC
 PORT_PTDPE=0b01000000; // Pullup PortD
//*******************************************************************
 ICS_C2=0x00; // 
 ICS_C1=0x04; //

 ICS_C3 = *(char*)0xFF6FU;           /* Initialize ICS_C3 register from a non volatile memory */
 ICS_C4 = (char)((*(char*)0xFF6EU)&(char)0x01U); /* Initialize ICS_C4 register from a non volatile memory */

//*******************************************************************
// Habilita Clocks dos periféricos.
// 
 SCG_C1=0b10100010;
//*******************************************************************
// Configura MTIM para Gerar interrupção periódica
// 
 MTIM0_MOD = 0;
 MTIM0_CLK = 0b00000110; //
 MTIM0_SC = 0b01000000; // 
//*******************************************************************
// Acerta a multiplexação dos pinos aos periféricos.
// 
 SYS_SOPT1 = 0b10001100; // RSTPE=0
 SYS_SOPT3 = 0b01000000; //
//*******************************************************************
 //FTM0_C0SC = 0b00111000; // FTM0 como contador de tempo para
 FTM0_SC  = 0b00001011; // recepção de RF.
 FTM0_MOD = 0;   // 
//*******************************************************************
// Configura FTM2 como PWM para os Led´s.
// 
 FTM2_C0SC = 0b00111000;  // PWM Led 
 FTM2_C1SC = 0b00111000;  // PWM Led
 FTM2_C2SC = 0b00111000;  // PWM Led
 FTM2_SC  = 0b01001011;  // 
 FTM2_MOD = 1000;   // Contagem Máxima do Timer.
 FTM2_C0V = 0;    // Ciclo ativo Led
 FTM2_C1V = 0;    // Ciclo ativo Led
 FTM2_C2V = 0;    // Ciclo ativo Led 
//*******************************************************************
// Configura Conversor A/D.
// 
 ADC_APCTL2 = 0b00000000; //
 ADC_APCTL1 = 0b10000000; // Entradas analógicas 
  
 ADC_SC3  = 0b01111001; // 
 ADC_SC2  = 0b00000000; //
 ADC_SC1  = 0b00100111; // 
  
 NVM_FCLKDIV = 0x07;
 
 DisableInterrupts;
 __RESET_WATCHDOG();  /* feeds the dog */
 EnableInterrupts;‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍